// Definition
Savings Plans are a flexible pricing model from AWS that offer discounts of up to 66% versus on-demand pricing in exchange for a commitment to a consistent amount of usage (measured in $/hour) for 1 or 3 years. Unlike Reserved Instances, Savings Plans apply automatically across multiple services, instance types, and regions without requiring upfront specification of what you'll run.
// Why It Matters
Three Savings Plan types: Compute Savings Plans apply across EC2, Lambda, and Fargate in any region, any instance family, any OS — maximum flexibility, up to 66% savings. EC2 Instance Savings Plans lock to a specific instance family in a specific region but offer deeper discounts (up to 72%) with flexibility to change size and OS within that family. SageMaker Savings Plans apply specifically to ML training and inference workloads on SageMaker.
The practical recommendation for most organizations: start with Compute Savings Plans. The flexibility means you're not locked to a specific instance type — if you migrate to Graviton, change regions, or shift workloads between EC2 and Lambda, the Savings Plan discount follows automatically. The discount is slightly less than Standard RIs, but the reduced commitment risk is worth it for most FinOps practices below $5M/year cloud spend.
Savings Plans and Reserved Instances can coexist in the same account — RIs are applied first, then Savings Plans cover remaining on-demand usage. Coverage and utilization monitoring via AWS Cost Explorer → Savings Plans dashboard is essential; low utilization means you're paying for commitment you're not using. Full comparison: Reserved Instances vs Savings Plans.
// In Practice
Scenario: A company commits to $10/hour of Compute Savings Plans (1-year, no upfront). This covers approximately $87,600/year of compute at on-demand rates, delivering the same value at ~$58,000 — a $29,600 saving. The commitment is flexible: when the team migrates 30% of EC2 workloads to Lambda three months later, the Savings Plan automatically applies to Lambda usage. No action required, no wasted commitment.